Question

我有一个包含10个项目的CheckedListBox。在每个项目上检查是否正在调用方法。我想禁用正在执行该方法的特定项目的复选框，以便用户在作业完成之前无法取消选中该项目。

**取消选中某个项会调用另一种方法。

以下是ItemCheck事件的代码

private void host_listbox_ItemCheck(object sender, ItemCheckEventArgs e)
        {

            int index = e.Index;
            try
            {
                string sitem = host_listbox.Items[index].ToString();
                host_list[sitem].checked_event=e;
                if (!host_list[sitem].is_busy)
                {
                    host_config.listEnabled = false;
                    host_list[sitem].con_worker.RunWorkerAsync();

                }
                if (host_listbox.GetItemCheckState(index) == CheckState.Checked)
                {
                    host_list[sitem].connected = false;
                }

            }
            catch(Exception ex)
            {
                output_textbox.AppendText("connection failed..............." +ex.ToString() +Environment.NewLine);

            }



        }

Answer 1

您可以使用此代码

检查/取消选中checkedListBox中的项目

checkedListBox.SetItemChecked(item, true);

更多信息请转到microsoft documentation

Answer 2

  private void host_listbox_ItemCheck(object sender, ItemCheckEventArgs e)
  {

      int index = e.Index;
      try
      {
          string sitem = host_listbox.Items[index].ToString();
          if (host_list[sitem].is_busy // or whatever indicates that background worker is running or any condition that specifies, that you do not want to let this item to be changed)
              e.NewValue = e.CurrentValue; //Change the value back
          else
          { 
          //Let the checked state of the item change

Answer 3

如果关联的后台工作正在运行，此代码会阻止检查状态更改：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        workerList = new List<BackgroundWorker>();

        for (int i = 0; i < 10; i++)
        {
            var el = new BackgroundWorker();
            el.DoWork += (s, e) =>
            {
                Thread.Sleep(5000);
            };

            workerList.Add(el);
            checkedListBox1.Items.Add("el " + i);
        }
    }

    private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
    {
        var worker = workerList[e.Index];

        if (worker.IsBusy)
        {
            e.NewValue = e.CurrentValue;
            return;
        }

        if (e.NewValue == CheckState.Checked)
            worker.RunWorkerAsync();
    }

    public List<BackgroundWorker> workerList { get; set; }
}

Answer 4

请注意，只有功能解决方案才是设置选择模式

CheckedListBox.SelectionMode = SelectionMode.None;

如何禁用c＃中checkedlistbox中项目的选中/取消选中

4 个答案: